Wireless power transmission device of unmanned aerial vehicle

Abstract

The invention discloses a wireless power transmission device for an unmanned aerial vehicle, and the device comprises a receiving end, and the receiving end comprises a coupling coil which is formed by winding a Litz wire; a circuit module; the magnetic isolation structure adopts a ferrite-nanocrystalline composite laminated structure and is arranged between the coupling coil and the circuit module; and the aluminum nitride insulation radiator is arranged between the magnetic isolation structure and the circuit module, so that a preset buffer space is formed between the magnetic isolation structure and the circuit module. According to the embodiment of the invention, the wireless power transmission device of the unmanned aerial vehicle charges the battery of the unmanned aerial vehicle under high density and high efficiency, electromagnetic interference generated by a circuit structure on the unmanned aerial vehicle under the action of a high-frequency magnetic field and eddy-current loss generated on a metal structure of the unmanned aerial vehicle due to the action of magnetic field leakage are reduced, and the safety and reliability of the wireless power transmission process of the unmanned aerial vehicle are ensured.

Description

Technical Field

[0001] This invention relates to a wireless power transmission device for unmanned aerial vehicles (UAVs) based on a layered composite magnetic shielding structure, belonging to the field of wireless power transmission. Background Technology

[0002] Wireless Power Transmission (WPT) is a contactless, fast charging method widely used in various fields. Among them, magnetically coupled WPT technology, due to its high energy density and high power, has become a hot research topic for its application in drones.

[0003] Currently, mainstream autonomous power replenishment technologies for drones mainly include modular battery replacement, contact charging, and WPT (Wireless Power Tolerance) solutions. Battery replacement systems rely on high-precision mechanical docking mechanisms, resulting in bulky ground base stations and high maintenance costs. While contact charging solutions can achieve rapid power replenishment, repeated plugging and unplugging operations can easily cause contact wear and pose safety hazards such as arc discharge and impedance mismatch. In contrast, WPT technology, with its non-physical contact and reliable characteristics, provides an innovative solution for building autonomous power replenishment systems for drones.

[0004] A typical magnetically coupled WPT (Wireless Power Transmission) device for unmanned aerial vehicles (UAVs) mainly consists of an inverter circuit, a compensation circuit, a magnetic coupling coil structure, a rectifier circuit, and a voltage regulator circuit. However, during operation, magnetic field leakage from the coupling coil poses a series of challenges: First, the leaked magnetic field can cause electromagnetic interference to the WPT circuit and other airborne circuits on the UAV; second, it generates eddy current losses in the UAV's metal structural components, leading to a decrease in system charging efficiency; furthermore, the leaked high-frequency alternating magnetic field may burn out the airborne PCB circuitry. Therefore, how to effectively isolate the leaked magnetic field from the coupling coil during charging, thereby improving charging efficiency, is an important technical issue in this field. Summary of the Invention

[0005] In view of this, this invention proposes a UAV wireless power transmission device based on a stacked composite magnetic shielding structure. It aims to solve the problem of eddy current losses in the UAV's metal structure caused by alternating magnetic field leakage, leading to decreased transmission efficiency in existing UAV wireless power transmission technologies. Its main technical solutions include: using Litz wire-wound coupling coils to reduce the skin effect of high-frequency currents, thereby increasing the input current; and simultaneously using a stack of ferrite and nanocrystalline materials for magnetic shielding to reduce magnetic field leakage. The combined effect of these two methods ultimately improves the overall transmission efficiency of the UAV wireless power transmission system.

[0006] The first objective of this invention is to provide a wireless power transmission device for unmanned aerial vehicles (UAVs).

[0007] A second objective of this invention is to provide another wireless power transmission device for unmanned aerial vehicles (UAVs).

[0008] A third objective of this invention is to provide yet another wireless power transmission device for unmanned aerial vehicles.

[0009] The first objective of this invention can be achieved by adopting the following technical solution: A wireless power transmission device for unmanned aerial vehicles (UAVs) includes a receiver, the receiver comprising: The coupling coil is wound with Litz wire; Circuit module; The magnetic shielding structure adopts a ferrite-nanocrystalline composite stacked structure and is set between the coupling coil and the circuit module; An aluminum nitride insulated heat sink is placed between the magnetic shielding structure and the circuit module, creating a preset buffer gap between them.

[0010] In some embodiments, the magnetic shielding structure includes a ferrite layer disposed adjacent to the coupling coil and a nanocrystalline layer stacked on the ferrite layer.

[0011] In some embodiments, the ferrite layer is a single-layer structure, and the nanocrystalline layer is a three-layer stacked structure.

[0012] In some embodiments, the buffer spacing is 6~10mm.

[0013] In some embodiments, a transmitter is also included, the transmitter comprising: The coupling coil is wound with Litz wire; Circuit module; The magnetic shielding structure adopts a ferrite-nanocrystalline composite stacked structure and is set between the coupling coil and the circuit module; An aluminum nitride insulated heat sink is placed between the magnetic shielding structure and the circuit module, so that the magnetic shielding structure and the circuit module form a preset buffer gap; The transmitting coil is larger than the receiving coil, and both the transmitting coil and the receiving coil are rectangular structures.

[0014] In some embodiments, the Litz wire is formed by stranding 700 to 900 individually insulated fine conductors, each with a diameter of 0.035 to 0.045 mm.

[0015] In some embodiments, an S / SP compensation network is also included, which performs power compensation on the coupled coil: a T-type transformer model is used for theoretical analysis, and the optimal compensation parameters are obtained through theoretical analysis and power compensation is performed.

[0016] In some embodiments, the thickness of the three-layer stacked structure is less than the thickness of the single-layer structure.

[0017] The second objective of this invention can be achieved by adopting the following technical solution: A wireless power transmission device for unmanned aerial vehicles (UAVs) includes a receiver, the receiver comprising: The coupling coil is wound with Litz wire; Circuit module; The magnetic isolation structure, including the main magnetic flux path guiding unit and the secondary magnetic field control unit, is located between the coupling coil and the circuit module; An insulating heat sink is placed between the magnetic shielding structure and the circuit module to create a preset buffer gap between them.

[0018] The third objective of this invention can be achieved by adopting the following technical solution: A wireless power transmission device for unmanned aerial vehicles (UAVs) includes a transmitter, the transmitter comprising: The coupling coil is wound with Litz wire; Circuit module; The magnetic isolation structure, including the main magnetic flux path guiding unit and the secondary magnetic field control unit, is located between the coupling coil and the circuit module; An insulating heat sink is placed between the magnetic shielding structure and the circuit module to create a preset buffer gap between them.

[0019] The present invention has the following advantages over the prior art: In this embodiment of the invention, the UAV wireless power transmission device includes a receiving end, which comprises: a coupling coil wound with Litz wire; a circuit module; a magnetic shielding structure, employing a ferrite-nanocrystalline composite stacked structure, disposed between the coupling coil and the circuit module; and an aluminum nitride insulated heat sink, disposed between the magnetic shielding structure and the circuit module, forming a preset buffer gap between the magnetic shielding structure and the circuit module. This embodiment of the invention enables the UAV wireless power transmission device to charge the UAV battery at high density and high efficiency, reducing electromagnetic interference generated by the high-frequency magnetic field on the UAV's circuit structure and eddy current losses caused by magnetic field leakage on the UAV's metal structure, thus ensuring the safety and reliability of the UAV wireless power transmission process. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1This is a T-type equivalent circuit diagram of a coupling coil according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of an optimized transmitting coil and receiving coil according to an embodiment of the present invention.

[0023] Figure 3 This is a diagram showing the magnetic field distribution of a coil in a Maxwell simulation according to an embodiment of the present invention.

[0024] Figure 4 This diagram illustrates the impact of different magnetic shielding structures on system efficiency in an embodiment of the present invention.

[0025] Figure 5 This is a diagram of a layered composite magnetic shielding structure according to an embodiment of the present invention.

[0026] Figure 6 This is a prototype diagram of a drone wireless power transmission device system according to an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of an overall prototype of a wireless power transmission device for unmanned aerial vehicles (UAVs) according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] like Figures 2 to 7 As shown, this embodiment provides a wireless power transmission device for unmanned aerial vehicles (UAVs). The UAV wireless power transmission device includes a receiver located within the UAV. The receiver includes: a coupling coil wound with Litz wire; a circuit module; a magnetic shielding structure including a dominant magnetic flux path guiding unit and a secondary magnetic field control unit, disposed between the coupling coil and the circuit module; and an insulating heat sink disposed between the magnetic shielding structure and the circuit module, creating a preset buffer distance between them. The UAV wireless power transmission device also includes a transmitter located on a charging platform. The transmitter includes: a coupling coil wound with Litz wire; a circuit module; a magnetic shielding structure including a dominant magnetic flux path guiding unit and a secondary magnetic field control unit, disposed between the coupling coil and the circuit module; and an insulating heat sink disposed between the magnetic shielding structure and the circuit module, creating a preset buffer distance between them.

[0030] The drone wireless power transmission device adopts a ferrite-nanocrystalline composite stacked structure. By optimizing the material stacking sequence, it achieves effective control of the magnetic flux path, reducing interference from the external magnetic field on the circuit module on the back of the adjacent coil 100. Figure 5 As shown, the dominant magnetic flux path guiding unit is a ferrite layer 200, and the secondary magnetic field control unit is a nanocrystalline layer 300. The magnetic isolation structure includes a ferrite layer 200 disposed adjacent to the coupling coil and a nanocrystalline layer 300 stacked on the ferrite layer 200. The ferrite layer 200 is a single-layer structure, and the nanocrystalline layer 300 is a three-layer stacked structure.

[0031] like Figure 3 As shown, the flux control efficiency of the stacked magnetic shielding structure was verified using Maxwell electromagnetic simulation. In the simulation, a ferrite substrate with a minimum thickness of 1 mm was placed on the back of both the transmitting and receiving coils, and the magnetic field distribution characteristics of single-layer and double-layer ferrite schemes were compared and analyzed. The results show that the magnetic field strength in the middle of the back of the coil is significantly lower when using double-layer ferrite than that of the single-layer ferrite scheme. However, although the magnetic shielding structure composed of multiple stacked ferrite layers can achieve better magnetic shielding, its larger volume and weight increase the payload of the UAV; therefore, a comprehensive trade-off is required in practical applications.

[0032] To balance lightweight design and high-efficiency magnetic shielding, a composite magnetic shielding layer is constructed by combining nanocrystalline materials and ferrite. The nanocrystalline material can be one-fifth the thickness of the ferrite layer while being significantly lighter. Figure 4 Experiments show that the WPT system using a three-layer nanocrystalline stack is superior to the single-layer ferrite system in suppressing eddy current losses, and its volume and weight are significantly reduced. Therefore, a stacked structure of three-layer nanocrystalline and single-layer ferrite was chosen to replace the original two-layer ferrite structure.

[0033] However, nanocrystalline materials exhibit significantly higher conductivity than ferrites, resulting in greater eddy current losses in alternating magnetic fields. Tests revealed that when using a three-layer nanocrystalline stack, the efficiency of the non-integrated system decreased compared to both a two-layer nanocrystalline stack and a single-layer ferrite.

[0034] Based on this, a ferrite-nanocrystalline composite stacked structure was ultimately chosen to combine the excellent magnetic permeability of ferrite with the thinness and lightness of nanocrystals. Specifically, the arrangement is as follows: a ferrite with lower conductivity is placed near the coil side to guide the main magnetic flux path; three layers of nanocrystals with higher conductivity are stacked behind it to achieve secondary control of the leakage magnetic field.

[0035] The UAV wireless power transmission device uses an aluminum nitride insulated heat sink to dissipate heat from the circuit PCB. Its dielectric properties effectively prevent the generation of eddy currents in a magnetic field. The aluminum nitride insulated heat sink is placed between the circuit module and the magnetic shielding structure, forming a buffer gap of 6-10mm, preferably 8mm, to maintain system compactness, reduce the magnetic field strength of the circuit module, and decrease system eddy current losses.

[0036] The eddy current loss generated by the receiving circuit module in the magnetic field can be calculated using the formula for the power consumption per unit mass of eddy currents on a metal block or wire. P e With the square of the magnetic field strength B m 2 Transmission frequency f and conductor geometric parameters d There is a positive correlation. An aluminum nitride insulating heat sink with excellent thermal conductivity is used. Due to its dielectric properties, the heat sink effectively avoids the generation of eddy currents in the magnetic field. At the same time, the heat sink is placed between the magnetic shielding structure and the circuit PCB to form an 8mm buffer gap, which maintains the system compactness and reduces the magnetic field strength of the circuit module.

[0037] Furthermore, by optimizing the circuit layout, shortening the wire length, and reducing the copper area of ​​the electrical network, the geometric parameters of the conductor in the magnetic field are changed, thereby reducing the eddy current loss of the circuit module.

[0038] The wireless power transmission device for unmanned aerial vehicles (UAVs) employs Litz wire wound coils to mitigate the skin effect under high-frequency current, reducing AC resistance and power loss. The Litz wire is composed of 700-900 strands of independently insulated fine conductors, each with a diameter of 0.035-0.045mm, twisted together. By using Litz wire wound coils made of multiple strands of independently insulated fine conductors, the skin effect of the current is reduced, achieving uniform current distribution, thereby reducing AC resistance and power loss. Comparative tests of coils wound with different specifications of Litz wire at different frequencies show that 0.04mm*800-strand Litz wire exhibits the best performance with a temperature rise of 45.1℃ at 200kHz, across different frequency currents and Litz wire specifications. Figure 2 As shown, rectangular transmitting and receiving coils are wound with 800 strands of 0.04mm diameter Litz wire. The transmitting coil measures 120mm x 60mm, and the receiving coil measures 60mm x 30mm. By using a design where the transmitting coil is larger than the receiving coil, the coils are designed as rectangles with a higher coupling coefficient compared to other topologies. This ensures compatibility with UAVs while expanding the magnetic field coverage and improving power transmission efficiency.

[0039] The UAV wireless power transmission device uses an S / SP (Series / Series-Parallel) compensation network structure to compensate the power of the coupled coil. Considering that the attitude deviation during the UAV landing process will cause fluctuations in the coil coupling coefficient, a T-type transformer model is used for theoretical analysis. The optimal compensation parameters are obtained through theoretical analysis, and the designed power conversion circuit is systematically electrically simulated using the PLECS simulation platform, which effectively verifies the theoretical analysis results of the gain relationship of each stage of the circuit.

[0040] The main steps of the design method provided by this invention are as follows: (1) Compensation network design: used for power compensation of the coupling coil of the wireless power transmission device of UAV.

[0041] (2) Coil optimization design: Litz wire winding coil is used to alleviate the skin effect under high frequency current, and reduce AC resistance and power loss.

[0042] (3) Optimized design of magnetic shielding structure: adopting ferrite-nanocrystalline composite stacked structure, and effectively controlling the magnetic flux path by optimizing the material stacking sequence, thereby reducing the interference of the circuit module on the back of the adjacent coil with the external magnetic field.

[0043] (4) Eddy current loss optimization design: Aluminum nitride insulated heat sink is used for heat dissipation of the circuit PCB. Its dielectric properties effectively prevent the generation of eddy currents in the magnetic field. The aluminum nitride insulated heat sink is placed between the circuit module and the magnetic shielding structure to form an 8mm buffer gap between the circuit module and the magnetic shielding structure, maintaining the compactness of the system, reducing the magnetic field strength of the circuit module and reducing the eddy current loss of the system.

[0044] As a preferred embodiment of the present invention, the compensation network design process in step (1) is as follows: (1-1) An S / SP (Series / Series-Parallel) compensation network structure is adopted.

[0045] (1-2) Considering that the attitude deviation during the UAV landing process will cause fluctuations in the coil coupling coefficient, a T-type transformer model is used for theoretical analysis, such as... Figure 1 As shown.

[0046] (1-3) The optimal compensation parameters were obtained through theoretical analysis, and the designed power conversion circuit was systematically electricalally simulated using the PLECS simulation platform, which effectively verified the theoretical analysis results of the gain relationship of each stage of the circuit.

[0047] As a preferred embodiment of the present invention, the coil optimization design process in step (2) is as follows: (2-1) By using Litz wire, which is made of multiple strands of independent insulated fine conductors, to wind the coil, the skin effect of the current is reduced, and the current is evenly distributed, thereby reducing AC resistance and power loss.

[0048] (2-2) The test results of coils wound with different specifications of Litz wire at different frequencies show that the 0.04mm*800 strand Litz wire has the best performance with a temperature rise of 45.1℃ at 200KHz when tested with different frequency currents and different specifications of Litz wire.

[0049] (2-3) Rectangular transmitting and receiving coils are wound with 800 strands of 0.04mm diameter Litz wire. The transmitting coil measures 118mm x 60mm, and the receiving coil measures 60mm x 30mm. Figure 2 As shown, by employing a design where the transmitting coil is larger than the receiving coil, the magnetic field coverage can be expanded and the power transmission efficiency improved while ensuring compatibility with UAVs. Furthermore, the rectangular coil has a higher coupling coefficient compared to other topologies.

[0050] As a preferred embodiment of the present invention, the magnetic shielding structure design process in step (3) is as follows: (3-1) The flux control efficiency of the laminated magnetic shielding structure was verified by Maxwell electromagnetic simulation. The magnetic field distribution is as follows: Figure 3 As shown.

[0051] (3-2) In the simulation experiment, the back of the transmitting / receiving coils were respectively equipped with a ferrite substrate with a minimum thickness of 1mm, and the magnetic field distribution characteristics of single-layer and double-layer ferrite were compared and analyzed. The double-layer ferrite can make the magnetic field strength in the middle of the back of the coil lower than that of the single-layer ferrite scheme.

[0052] (3-3) Although the magnetic shielding structure composed of multi-layer ferrite stacks has a good magnetic shielding effect, the ferrite has a large volume and weight, which will increase the payload of the UAV. A magnetic shielding layer is formed by combining a nanocrystalline magnetic shielding material with a thickness of 1 / 5 that of ferrite and a light weight with ferrite.

[0053] (3-4) For example Figure 4 As shown in the experimental comparison, the WPT system used in the three-layer nanocrystalline stack is superior to the single-layer ferrite system in suppressing eddy current losses. Furthermore, the volume and weight of the three-layer nanocrystalline material are significantly smaller than those of the single-layer ferrite. Therefore, a stacked structure of three-layer nanocrystalline material and single-layer ferrite was chosen instead of a two-layer ferrite stacked structure.

[0054] (3-5) Nanocrystalline materials have significantly higher conductivity than ferrites, resulting in greater eddy current losses in a magnetic field. When using a three-layer nanocrystalline material stacked structure, the efficiency of the non-integrated system decreases compared to a two-layer nanocrystalline stacked structure and a single-layer ferrite. Therefore, based on the excellent magnetic properties of traditional ferrites and the thinness and lightness of nanocrystalline materials, this embodiment ultimately designs a ferrite-nanocrystalline material composite stacked structure. For example... Figure 5 As shown, a low-conductivity ferrite is arranged near the coil to guide the dominant magnetic flux path, and three layers of highly conductive nanocrystals are stacked behind it for secondary magnetic field modulation.

[0055] As a preferred embodiment of the present invention, the eddy current loss optimization design process in step (4) is as follows: (4-1) Regarding the eddy current loss generated by the receiving circuit module in the magnetic field, the formula for calculating the power consumption per unit mass generated by the eddy current on the metal block or wire shows that the eddy current loss P of the circuit module is... e With the square of the magnetic field strength B m 2 The transmission frequency f and the conductor geometric parameter d are positively correlated.

[0056] (4-2) Use aluminum nitride insulated heat sinks with excellent thermal conductivity, such as... Figure 6 As shown, it is placed on the back of the receiving circuit for heat dissipation. The magnetic shielding structure is placed between the heat sink and the receiving coil. Due to its dielectric properties, the heat sink effectively avoids the generation of eddy currents in the magnetic field. At the same time, placing the heat sink between the magnetic shielding structure and the circuit PCB forms an 8mm buffer gap, which maintains the compactness of the system and reduces the magnetic field strength of the circuit module.

[0057] (4-3) By optimizing the circuit layout, shortening the wire length and reducing the copper area of ​​the electrical network, the geometric parameters of the conductor in the magnetic field are changed, thereby further reducing the eddy current loss of the circuit module.

[0058] According to this embodiment, the UAV wireless power transmission device based on a stacked composite magnetic shielding structure includes an inverter circuit, a compensation circuit, a coupling coil structure, a magnetic shielding structure, a rectifier circuit, and a voltage regulator circuit. The inverter circuit converts the output 80V DC power into 200kHz AC power. The compensation circuit compensates for reactive power loss in the coupling coil, reducing system reactive power loss. The coupling coil structure couples the primary circuit current to the secondary circuit, serving as a crucial energy conversion device in the wireless power transmission process. The magnetic shielding structure reduces the electromagnetic interference of the external magnetic field from the coupling coil structure on other circuit PCBs on the UAV, improving overall system efficiency. The rectifier circuit rectifies the AC output from the secondary coupling coil into DC power. The voltage regulator circuit regulates the DC output from the rectifier circuit, ultimately providing stable power output to the UAV battery module.

[0059] Based on the above, the UAV wireless power transmission device based on the stacked composite magnetic shielding structure described in this embodiment can operate at a rated power of 100W, with an effective current of 7.1557A for the receiving coil. After 20 minutes of operation, the temperature of the receiving coil stabilizes at 70°C. Without external heat dissipation, the temperature of the circuit module approaches 100°C after 20 minutes of operation. When the transmitting and receiving coils are directly aligned, the system transmission efficiency reaches 86.12%. When the x-axis and y-axis of the transmitting and receiving coils are offset by 25% respectively, the transmission efficiency remains at 86.33% and 84.00% respectively.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A wireless power transmission device for unmanned aerial vehicles (UAVs), comprising a receiver, characterized in that, The receiving end includes: The coupling coil is wound with Litz wire; Circuit module; The magnetic shielding structure adopts a ferrite-nanocrystalline composite stacked structure and is set between the coupling coil and the circuit module; An aluminum nitride insulated heat sink is placed between the magnetic shielding structure and the circuit module, creating a preset buffer gap between them.

2. The UAV wireless power transmission device according to claim 1, characterized in that, The magnetic shielding structure includes a ferrite layer disposed adjacent to the coupling coil and a nanocrystalline layer stacked on the ferrite layer.

3. The UAV wireless power transmission device according to claim 2, characterized in that, The ferrite layer is a single-layer structure, and the nanocrystalline layer is a three-layer stacked structure.

4. The UAV wireless power transmission device according to claim 1, characterized in that, The buffer spacing is 6~10mm.

5. The UAV wireless power transmission device according to claim 1, characterized in that, It also includes a transmitter, which includes: The coupling coil is wound with Litz wire; Circuit module; The magnetic shielding structure adopts a ferrite-nanocrystalline composite stacked structure and is set between the coupling coil and the circuit module; An aluminum nitride insulated heat sink is placed between the magnetic shielding structure and the circuit module, so that the magnetic shielding structure and the circuit module form a preset buffer gap; The transmitting coil is larger than the receiving coil, and both the transmitting coil and the receiving coil are rectangular structures.

6. The UAV wireless power transmission device according to claim 1, characterized in that, The Litz wire is made of 700-900 strands of individually insulated fine conductors, each with a diameter of 0.035-0.045mm.

7. The UAV wireless power transmission device according to claim 1, characterized in that, It also includes an S / SP compensation network, which performs power compensation on the coupled coil: a T-type transformer model is used for theoretical analysis, and the optimal compensation parameters are obtained through theoretical analysis to perform power compensation.

8. The UAV wireless power transmission device according to claim 3, characterized in that, The thickness of the three-layer stacked structure is less than the thickness of the single-layer structure.

9. A wireless power transmission device for unmanned aerial vehicles (UAVs), comprising a receiver, characterized in that, The receiving end includes: The coupling coil is wound with Litz wire; Circuit module; The magnetic isolation structure, including the main magnetic flux path guiding unit and the secondary magnetic field control unit, is located between the coupling coil and the circuit module; An insulating heat sink is placed between the magnetic shielding structure and the circuit module to create a preset buffer gap between them.

10. A wireless power transmission device for unmanned aerial vehicles (UAVs), comprising a transmitter, characterized in that, The transmitter includes: The coupling coil is wound with Litz wire; Circuit module; The magnetic isolation structure, including the main magnetic flux path guiding unit and the secondary magnetic field control unit, is located between the coupling coil and the circuit module; An insulating heat sink is placed between the magnetic shielding structure and the circuit module to create a preset buffer gap between them.

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